Emma Hayes had mixed feelings despite seeing Chelsea condemn holders Barcelona to a first home defeat for five years and edge closer to the Champions League final.

Erin Cuthbert’s first-half goal clinched a precious 1-0 semi-final first-leg win at the Estadi Olimpic Lluis Companys to set the Women’s Super League leaders up perfectly for the return at Stamford Bridge next Saturday.

It was a first competitive victory for the Blues over Barca, who knocked them out at the same stage last season on their way to a second European title, and came courtesy of a superb defensive effort – but boss Hayes was left wondering what might have been.

She told DAZN: “It’s just half-time. Nobody should get carried away with that and to be honest, I’m disappointed we didn’t get the second goal.

“It’s a difficult place to come and they carried out the game plan I asked them to do – so from that perspective, I’m happy.”

The Blues had to soak up early pressure but did so to such effect that Barca did not muster a single shot on target during a tense encounter.

Cuthbert’s 40th-minute strike gave the visitors the lead and, having seen French referee Stephanie Frappart reverse her decision to award a penalty against Kadeisha Buchanan for handball after the break, they might have increased their advantage.

Salma Paralluelo and substitute Alexia Putellas could have salvaged a draw amid a late flurry but Chelsea held firm.

Hayes is well aware of the threat Barcelona will pose in the second leg.

Hayes said: “I think I know how to come away from home and get a result. We have under-performed against Barcelona at home.

“Barcelona have another level in them and I think that’s clear. Maybe they don’t feel they were at their best today and we have to anticipate that.”

Erin Cuthbert gave Chelsea a priceless first-leg lead in their Champions League semi-final against Barcelona after inflicting a first home defeat for five years on the holders.

Cuthbert’s 40th-minute strike was enough to secure a 1-0 win at the Estadi Olimpic Lluis Companys – Barca’s first defeat of the season – on an afternoon when the Blues produced a superb defensive display to deny the free-scoring defending champions a single shot on target.

Things might have been different, however, had referee Stephanie Frappart not been advised to review her decision to award the hosts a second-half penalty for handball to leave Emma Hayes and her players with something to defend at Stamford Bridge next Saturday.

Jess Carter and Kadeisha Buchanan had to be resilient at the heart of the Blues defence early on, although it took a well-timed intervention by Ingrid Engen to prevent Johanna Rytting Kaneryd from making the most of Cuthbert’s 10th-minute ball over the top.

Carter had to be in the right place at the right time to block Salma Paralluelo’s 16th-minute shot after a pacy break by Aitana Bonmati and Buchanan was equally alert to deny the same player after she had burst clear six minutes later.

The visitors were growing into the game with Mayra Ramirez making in-roads down the left and they got their reward five minutes before the break when Sjoeke Nusken held the ball up and then squared for Cuthbert, whose shot looped up off Engel and over keeper Catalina Coll.

But they looked to be in trouble seconds later when the referee awarded a penalty against Buchanan after she had blocked Patri Guijarro’s goal-bound effort with her arm, only for a lengthy VAR review, which showed that Paralluelo had been offside in the build-up, to come to their rescue.

Paralluelo volleyed horribly wide after being picked out at the far post by Caroline Graham Hansen and substitute Alexia Putellas missed the target with salvation beckoning with the final kick of the game.

Referee Stephanie Frappart overturned a late penalty for Bayern Munich to ensure they were held to a goalless draw by Copenhagen in the Champions League.

The Group A fixture at Allianz Arena was not without controversy after Frappart pointed to the spot in the second minute of added time when the ball hit the arm of Peter Ankersen, but the French official was told to look at the incident on the pitchside monitor by VAR and changed her decision.

It occurred minutes after Bayern captain Manuel Neuer had made a superb double save to deny Mohamed Elyounoussi after Copenhagen produced an excellent display, although the post-match focus centred on Frappart.

Frappart’s decision to subsequently not give the spot-kick occurred 24 hours after Paris St Germain were given a controversial penalty against Newcastle in similar circumstances, but the draw did boost Copenhagen’s hopes of finishing second behind Bayern in the group.

Bayern boss Thomas Tuchel had confirmed on Tuesday that Thomas Muller would earn a rare start and he was one of four changes made from Friday’s win over Cologne, but Harry Kane still led the line for the home side.

While Bayern already had a place in the knockout phase assured, they were eager to keep up their perfect record.

Copenhagen had other ideas, especially after Galatasaray and Manchester United shared the spoils in the early kick-off, and the visitors had the first effort of note, but defender Denis Vavro dragged well wide from 35 yards.

The first opening for Bayern arrived 60 seconds later in the 14th minute when Muller’s header dropped for 18-year-old forward Mathys Tel, but he sliced wide.

Chances remained limited with the home team struggling to get out of second gear, although Raphael Guerreiro fired wide from a corner midway through the first half.

Tuchel would have been growing frustrated, but breathed a sigh of relief in the 27th minute when Copenhagen squandered a golden opportunity.

A skilful flick by Viktor Claesson sent Lukas Lerager away inside the area, but the midfielder cut back and teed up youngster Roony Bardghji, who curled wide from 14 yards.

It should have resulted in the breakthrough and Copenhagen were indebted to goalkeeper Kamil Grabara on the half-hour.

Bayern full-back Konrad Laimer got to the byline and his cross was headed back across goal by Tel, but Muller’s close-range header was brilliantly clawed away by Grabara.

The half-time sentiments of Tuchel failed to have the desired effect initially with Diogo Goncalves curling wide in the 47th minute for Copenhagen.

A chance was fashioned for the hosts just past the hour mark when Alphonso Davies laid into the path of Tel, but he sliced off target under pressure from Rasmus Falk.

Tuchel had already seen enough and that miss proved Tel’s last involvement with Leroy Sane and Serge Gnabry sent on with 26 minutes left.

Copenhagen remained a threat with Neuer forced to parry wide an effort by substitute Elias Achouri before Kane did finally get a sight at goal.

Kane let fly from 22 yards but his firm drive was pushed over by Grabara in the 68th minute.

Grabara looked to have made another stop four minutes later from a Sane free-kick, but a goal kick was awarded and Bayern substitute goalkeeper Sven Ulreich was shown a yellow card by Frappart amid whistles from the Munich supporters.

More whistles occurred with 84 minutes on the clock when Muller went down twice in quick succession in the area and yet both hopeful penalty appeals were waved away.

There was still time for Neuer to show his class with a fine save to thwart a header by Elyounoussi before the follow-up shot by the ex-Celtic attacker was also blocked by the Bayern captain, with Frappart overturning the stoppage-time penalty given after Frans Kratzig’s pass hit Ankersen’s arm.

Stephanie Frappart will referee the crucial World Cup clash between Germany and Costa Rica, where she will become the first female to take charge of a game at the men's tournament in its 92-year history.

Frappart will be in the middle for the Group E encounter at Al Bayt Stadium on Thursday, in which both teams can still qualify for the knockout stage in Qatar.

She was one of three female referees selected as part of the pool for the World Cup in May, along with Salima Mukansanga of Rwanda and Yoshimi Yamashita of Japan.

Frappart is no stranger to making history in the international game, having also been the first woman to officiate a men's World Cup qualifying match in March 2021 between the Netherlands and Latvia.

The French official has also refereed high-profile men's games at club level before, including the 2019 UEFA Super Cup between Chelsea and Liverpool, and a year later she became the first female referee of a Champions League group game, taking charge of Juventus' match against Dynamo Kyiv.

"The men's World Cup is the most important competition in the world, not only football," she told The Athletic in May when she was selected for the tournament. "But I was the first female referee in France, the first in Europe, every time the first. I know how to deal with that... You're there because you deserve it."

The entire on-field officiating team for the game will be female, with Frappart joined by assistants Neuza Back and Karen Diaz.

The 2022 men's World Cup will feature female referees for the first time in the competition's history.

FIFA announced on Thursday the list of 36 referees, 69 assistant referees and 24 video match officials that have been chosen for the tournament, which is to be held in Qatar in November and December.

Three female referees, Stephanie Frappart, Salima Mukansanga and Yoshimi Yamashita, and three assistant referees, Neuza Back, Kathryn Nesbitt and Karen Diaz Medina, have been included.

Frappart has experience in top-level European football, becoming the first female to referee a Champions League match and European Championship qualifiers, while she has also taken charge of Ligue 1 games.

Mukansanga became the first woman to referee a match at the Africa Cup of Nations, while Yamashita was the first woman to officiate an AFC Champions League match.

Pierluigi Collina, chairman of the FIFA Referees Committee, said: "We are very happy that with Stephanie Frappart from France, Salima Mukansanga from Rwanda and Yoshimi Yamashita from Japan, as well as assistant referees Neuza Back from Brazil, Karen Diaz Medina from Mexico and Kathryn Nesbitt from the USA, we have been able to call up female match officials for the first time in the history of a FIFA World Cup.

"This concludes a long process that began several years ago with the deployment of female referees at FIFA men's junior and senior tournaments.

"In this way, we clearly emphasise that it is quality that counts for us and not gender. I would hope that in the future, the selection of elite women's match officials for important men's competitions will be perceived as something normal and no longer as sensational.

"They deserve to be at the FIFA World Cup because they constantly perform at a really high level, and that's the important factor for us."

Premier League officials Michael Oliver and Anthony Taylor are also part of the referee team.

"As always, the criteria we have used is 'quality first' and the selected match officials represent the highest level of refereeing worldwide," Collina added.

"The 2018 World Cup was very successful, partly because of the high standard of refereeing, and we will do our best to be even better in a few months in Qatar.

"The pandemic affected our activities, in particular in 2020 and at the beginning of 2021. Luckily, the World Cup was still quite far, and we had enough time to provide the candidates with good preparation.

"We are announcing these selections well in advance as we want to work even harder with all those who have been appointed for the FIFA World Cup, monitoring them in the next months.

"The message is clear: don't rest on your laurels, keep working hard and prepare yourselves very seriously for the World Cup."